Owner's manual

6
2. Measurement Category
W ARNIN G
n
Measurement Category (CAT.)
The restrictions on the maximum voltage level for which the KEW1051, KEW1052 can
be used, depend on the measurement categories specied by the safety standards.
Do not apply any input level higher than maximum allowable input.
AC/DC 1000V CAT.III
AC/DC 600V CAT.IV
Measurement
category
Description Remarks
Ⅰ
CAT. I For measurements performed on circuits not
directly connected to MAINS.
Ⅱ
CAT. II For measurements performed on circuits directly
connected to the low voltage installation.
Appliances, portable
equipment, ect.
Ⅲ
CAT.III For measurements performed in the building
installation.
Distribution board,
circuit breaker, ect.
Ⅳ
CAT.
Ⅳ
For measurements performed all the source of the
low-voltage installation.
Overhead wire,
cable systems, ect.
Internal Wiring
Outlet
Entrance
Cable
Fixed Equipment,
etc.
Distribution
Board
CAT. II
Equipment
C A T.I
CAT.IV
CAT. III
Note
Radiation immunity affects the accuracy of the KEW1051, KEW1052 under the
conditions specied in IEC61326-1.
Use of this instrument is limited to domestic, commercial, and light industry
applications. If equipment generating strong electromagnetic interference is located
nearly, the instrument may malfunction.